Question

The value of Kpat 25°C for the reaction 2NO (g) + Cl2 (g) +2NOCI(g) is 1.9 ~ 103atm-1. Calculate the value of Kc at the same temperature.

Answer 1

$$2NO(g)+Cl_2(g)\leftrightarrow2NOCl(g)$$

In the reaction, (2+1) mol of gas reacts to give 2 mol of gas.

Hence, $\Delta n=2-3=-1.$

Using, $K_p=K_c(RT)^{\Delta n}:$

$$K_c=K_p(RT)^{-\Delta n}$$

$$K_c=1.9\times10^{-3}(0.08206(25+273))^1=4.646\times10^{-2}$$